package hhh;

public class builder1 {
    public static void main(String[]args)throws Exception{
        StringBuilder builder=new StringBuilder(30);
        builder.append("edu.yootk.com").insert(0,"李兴华编程训练营");
        System.out.println(builder.replace(9,25,"www.yootk.com").delete(0,9));

    }
}
